Sofa



FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines on the sofa in FIGS. 1, 2, and 4-6 are included to show unclaimed stitching on the article. The broken lines in FIG. 7 show portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 